#main{
    display: flex;
}
#main .aside{
    width: 200px;
    height: 600px;
    background-color: pink;
}
.aside-item{
    text-align: center;
    padding: 30px 0;
    border-bottom: 1px solid gray;
    cursor: pointer;
}

#main .content{
    height: 600px;
    background-color: lightblue;
    flex: 1;
}

